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id="post-info"><h1 class="post-title">Vue中的函数式组件</h1><div id="post-meta"><div class="meta-firstline"><span class="post-meta-date"><i class="far fa-calendar-alt fa-fw post-meta-icon"></i><span class="post-meta-label">发表于</span><time class="post-meta-date-created" datetime="2020-04-13T16:00:00.000Z" title="发表于 2020-04-14 00:00:00">2020-04-14</time><span class="post-meta-separator">|</span><i class="fas fa-history fa-fw post-meta-icon"></i><span class="post-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2019-06-02T16:00:00.000Z" title="更新于 2019-06-03 00:00:00">2019-06-03</time></span><span class="post-meta-categories"><span class="post-meta-separator">|</span><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/Vue/">Vue</a></span></div><div class="meta-secondline"><span class="post-meta-separator">|</span><span class="post-meta-wordcount"><i class="far fa-file-word fa-fw post-meta-icon"></i><span class="post-meta-label">字数总计:</span><span class="word-count">1.7k</span><span class="post-meta-separator">|</span><i class="far fa-clock fa-fw post-meta-icon"></i><span class="post-meta-label">阅读时长:</span><span>8分钟</span></span><span class="post-meta-separator">|</span><span class="post-meta-pv-cv" id="" data-flag-title="Vue中的函数式组件"><i class="far fa-eye fa-fw post-meta-icon"></i><span class="post-meta-label">阅读量:</span><span id="busuanzi_value_page_pv"></span></span></div></div></div></header><main class="layout" id="content-inner"><div id="post"><article class="post-content" id="article-container"><h1 id="函数式组件"><a href="#函数式组件" class="headerlink" title="函数式组件"></a>函数式组件</h1><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">1.</span>我们在写vue模板的时候 有些不是很灵活 所以就有了函数式组件</span><br><span class="line"><span class="number">2.</span>主要还式在写jsx 然后用render函数渲染到页面上</span><br><span class="line"><span class="number">3.</span>jsx 可以把他看成js 和html的集合 里面的变量可以写在标签上</span><br></pre></td></tr></table></figure>
<h2 id="解析"><a href="#解析" class="headerlink" title="解析"></a>解析</h2><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">1.</span>我们现在比如像实现一个标题组件 你给我传过来类型 我显示对应的H1、H2、H3之类的标签</span><br></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//调用标题组件的页面</span></span><br><span class="line">&lt;template&gt;</span><br><span class="line">  &lt;el-card <span class="class"><span class="keyword">class</span></span>=<span class="string">&quot;box-card&quot;</span>&gt;</span><br><span class="line">      &lt;div style=<span class="string">&quot;margin-bottom:30px;&quot;</span>&gt;render函数 函数式组件 JSX&lt;/div&gt;</span><br><span class="line">      &lt;div&gt;</span><br><span class="line">        <span class="comment">//你给我传进去的值 我就去判断  </span></span><br><span class="line">        &lt;level :numbner=<span class="string">&quot;1&quot;</span>&gt;标题&lt;/level&gt;</span><br><span class="line">        &lt;level :numbner=<span class="string">&quot;2&quot;</span>&gt;标题&lt;/level&gt;</span><br><span class="line">        &lt;level :numbner=<span class="string">&quot;3&quot;</span>&gt;标题&lt;/level&gt;</span><br><span class="line">        &lt;level :numbner=<span class="string">&quot;4&quot;</span>&gt;标题&lt;/level&gt;</span><br><span class="line">      &lt;/div&gt;</span><br><span class="line">  &lt;/el-card&gt;</span><br><span class="line">&lt;/template&gt;</span><br><span class="line"></span><br><span class="line">&lt;script&gt;</span><br><span class="line"><span class="keyword">import</span> level <span class="keyword">from</span> <span class="string">&#x27;@/views/page/nine/level&#x27;</span></span><br><span class="line"><span class="keyword">export</span> <span class="keyword">default</span> &#123;</span><br><span class="line">  components: &#123;</span><br><span class="line">    level</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br><span class="line">&lt;/script&gt;</span><br></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//组件 写了大量的if 和else 而且没用代码很多就不灵活</span></span><br><span class="line">&lt;template&gt;</span><br><span class="line">  &lt;div&gt;</span><br><span class="line">      &lt;h1 style=<span class="string">&quot;margin-bottom:20px;&quot;</span> v-<span class="keyword">if</span>=<span class="string">&quot;numbner === 1&quot;</span>&gt;</span><br><span class="line">          &lt;slot&gt;&lt;/slot&gt;</span><br><span class="line">      &lt;/h1&gt;</span><br><span class="line">      &lt;h2 style=<span class="string">&quot;margin-bottom:20px;&quot;</span> v-<span class="keyword">else</span>-<span class="keyword">if</span>=<span class="string">&quot;numbner === 2&quot;</span>&gt;</span><br><span class="line">          &lt;slot&gt;&lt;/slot&gt;</span><br><span class="line">      &lt;/h2&gt;</span><br><span class="line">      &lt;h3 style=<span class="string">&quot;margin-bottom:20px;&quot;</span> v-<span class="keyword">else</span>-<span class="keyword">if</span>=<span class="string">&quot;numbner === 3&quot;</span>&gt;</span><br><span class="line">          &lt;slot&gt;&lt;/slot&gt;</span><br><span class="line">      &lt;/h3&gt;</span><br><span class="line">      &lt;h4 style=<span class="string">&quot;margin-bottom:20px;&quot;</span> v-<span class="keyword">else</span>-<span class="keyword">if</span>=<span class="string">&quot;numbner === 4&quot;</span>&gt;</span><br><span class="line">          &lt;slot&gt;&lt;/slot&gt;</span><br><span class="line">      &lt;/h4&gt;</span><br><span class="line">      &lt;h5 style=<span class="string">&quot;margin-bottom:20px;&quot;</span> v-<span class="keyword">else</span>-<span class="keyword">if</span>=<span class="string">&quot;numbner === 5&quot;</span>&gt;</span><br><span class="line">          &lt;slot&gt;&lt;/slot&gt;</span><br><span class="line">      &lt;/h5&gt;</span><br><span class="line">  &lt;/div&gt;</span><br><span class="line">&lt;/template&gt;</span><br><span class="line"></span><br><span class="line">&lt;script&gt;</span><br><span class="line"><span class="keyword">export</span> <span class="keyword">default</span> &#123;</span><br><span class="line">  props: &#123;</span><br><span class="line">    numbner: &#123;</span><br><span class="line">      type: <span class="built_in">Number</span></span><br><span class="line">    &#125;</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br><span class="line">&lt;/script&gt;</span><br></pre></td></tr></table></figure>
<h2 id="函数式组件-1"><a href="#函数式组件-1" class="headerlink" title="函数式组件"></a>函数式组件</h2><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">1.</span>这个时候 函数式组件 和 jsx语法就变的很灵活</span><br><span class="line"><span class="number">2.</span>跟我们平时的vue组件一样的 也有自己的声明周期 和watche之类的</span><br></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//基础语法 默认导出一个对象 然后式一个render函数 h式形参 式一个createElement 创造元素的意思</span></span><br><span class="line"><span class="keyword">export</span> <span class="keyword">default</span> &#123;</span><br><span class="line">  <span class="function"><span class="title">created</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">      </span><br><span class="line">  &#125;, </span><br><span class="line">  render (h) &#123;</span><br><span class="line">    <span class="keyword">return</span> h(<span class="string">&#x27;你要创建的标签div什么的&#x27;</span>，&#123;<span class="string">&#x27;这里要写属性 比如绑定事件啊什么的&#x27;</span>&#125;,<span class="string">&#x27;标签里的内容&#x27;</span>)</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//示例 创建了一个h1标签绑定事件 设置了a=1的属性 内容式你好</span></span><br><span class="line"><span class="keyword">export</span> <span class="keyword">default</span> &#123;</span><br><span class="line">  render (h) &#123;</span><br><span class="line">    <span class="keyword">return</span> h(<span class="string">&#x27;h1&#x27;</span>,&#123;</span><br><span class="line">        on:&#123;</span><br><span class="line">            <span class="function"><span class="title">click</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">                alert(<span class="number">1</span>)</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;,</span><br><span class="line">        attrs:&#123;</span><br><span class="line">            a:<span class="number">1</span></span><br><span class="line">        &#125;</span><br><span class="line">    &#125;,<span class="string">&#x27;你好&#x27;</span>)</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//如果h1下还有标签 就要写数组 继续去创建</span></span><br><span class="line"><span class="keyword">export</span> <span class="keyword">default</span> &#123;</span><br><span class="line">  render (h) &#123;</span><br><span class="line">    <span class="keyword">return</span> h(<span class="string">&#x27;h1&#x27;</span>,&#123;</span><br><span class="line">        on:&#123;</span><br><span class="line">            <span class="function"><span class="title">click</span>(<span class="params"></span>)</span>&#123;</span><br><span class="line">                alert(<span class="number">1</span>)</span><br><span class="line">            &#125;</span><br><span class="line">        &#125;,</span><br><span class="line">        attrs:&#123;</span><br><span class="line">            a:<span class="number">1</span></span><br><span class="line">        &#125;</span><br><span class="line">    &#125;,[h(<span class="string">&#x27;span&#x27;</span>,&#123;&#125;,<span class="string">&#x27;来了&#x27;</span>)])</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<h2 id="jsx语法"><a href="#jsx语法" class="headerlink" title="jsx语法"></a>jsx语法</h2><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">1.</span>我们刚刚看到了h参数的让我们很头痛 要写很多嵌套</span><br><span class="line"><span class="number">2.</span>所以这里就有了jsx语法</span><br></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//注意jsx上的语法 只要涉及到事件 样式 变量的 都是以大括号开头</span></span><br><span class="line"><span class="keyword">export</span> <span class="keyword">default</span> &#123;</span><br><span class="line">  render (h) &#123;</span><br><span class="line">    <span class="keyword">return</span> <span class="xml"><span class="tag">&lt;<span class="name">h1</span> <span class="attr">on-click</span>=<span class="string">&#123;()</span> =&gt;</span> &#123; alert(1) &#125;&#125; style=&#123; &#123; color: &#x27;red&#x27; &#125; &#125;&gt; 你好 <span class="tag">&lt;/<span class="name">h1</span>&gt;</span></span></span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//这样我们在回到我们刚才的标题组件上去就好写了</span></span><br><span class="line"><span class="keyword">export</span> <span class="keyword">default</span> &#123;</span><br><span class="line">  <span class="comment">//首先这里拿到了你过来的式 是1 还是2  </span></span><br><span class="line">  props: &#123;</span><br><span class="line">    numbner: &#123;</span><br><span class="line">      type: <span class="built_in">Number</span></span><br><span class="line">    &#125;</span><br><span class="line">  &#125;,</span><br><span class="line">  render (h) &#123;</span><br><span class="line">    <span class="comment">//然后我们用字符串品标签 你给我传过来及 就是H几的标签  </span></span><br><span class="line">    <span class="keyword">const</span> tag = <span class="string">&#x27;h&#x27;</span> + <span class="built_in">this</span>.numbner</span><br><span class="line">    <span class="comment">//然后把变量写在标签里 如果有插槽的话 就可以通过this.$slots.default拿到插槽的值</span></span><br><span class="line">    <span class="keyword">return</span> <span class="xml"><span class="tag">&lt;<span class="name">tag</span> <span class="attr">style</span>=<span class="string">&#123;&#123;</span> <span class="attr">color:</span> &#x27;<span class="attr">red</span>&#x27; &#125;&#125;&gt;</span>&#123;this.$slots.default&#125;<span class="tag">&lt;/<span class="name">tag</span>&gt;</span></span></span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//我们使用一下函数式组件 导入js文件 然后命名render函数</span></span><br><span class="line">&lt;template&gt;</span><br><span class="line">  &lt;el-card <span class="class"><span class="keyword">class</span></span>=<span class="string">&quot;box-card&quot;</span>&gt;</span><br><span class="line">      &lt;div style=<span class="string">&quot;margin-bottom:30px;&quot;</span>&gt;render函数 函数式组件 JSX&lt;/div&gt;</span><br><span class="line">      &lt;div&gt;</span><br><span class="line">        &lt;level :numbner=<span class="string">&quot;1&quot;</span>&gt;标题&lt;/level&gt;</span><br><span class="line">        &lt;level :numbner=<span class="string">&quot;2&quot;</span>&gt;标题&lt;/level&gt;</span><br><span class="line">        &lt;level :numbner=<span class="string">&quot;3&quot;</span>&gt;标题&lt;/level&gt;</span><br><span class="line">        &lt;level :numbner=<span class="string">&quot;4&quot;</span>&gt;标题&lt;/level&gt;</span><br><span class="line">      &lt;/div&gt;</span><br><span class="line">  &lt;/el-card&gt;</span><br><span class="line">&lt;/template&gt;</span><br><span class="line"></span><br><span class="line">&lt;script&gt;</span><br><span class="line"><span class="keyword">import</span> level <span class="keyword">from</span> <span class="string">&#x27;@/views/page/nine/nine&#x27;</span></span><br><span class="line"><span class="keyword">export</span> <span class="keyword">default</span> &#123;</span><br><span class="line">  components: &#123;</span><br><span class="line">    level</span><br><span class="line">  &#125;</span><br><span class="line">&#125;</span><br><span class="line">&lt;/script&gt;</span><br></pre></td></tr></table></figure>
<h2 id="render方法定制组件"><a href="#render方法定制组件" class="headerlink" title="render方法定制组件"></a>render方法定制组件</h2><figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="number">1.</span>我们现在实现一个列表组件 组件里都式li 然后外层传进来一个数组 我们开始循环</span><br><span class="line"><span class="number">2.</span>但是又一天 我这个列表不想用li了 想用span 或者比的什么 这个时候就会很不灵活</span><br><span class="line"><span class="number">3.</span>所以我们来写一种高级的函数式组件</span><br></pre></td></tr></table></figure>
<figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">&lt;!--这式我们常写的方式--&gt;</span></span><br><span class="line">//这个是我们的列表组件 我们把数组传进去了</span><br><span class="line"><span class="tag">&lt;<span class="name">List</span> <span class="attr">:data</span>=<span class="string">&quot;data&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">List</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">script</span>&gt;</span></span><br><span class="line"><span class="javascript"><span class="keyword">import</span> List <span class="keyword">from</span> <span class="string">&quot;./components/List&quot;</span>;</span></span><br><span class="line"><span class="javascript"><span class="keyword">export</span> <span class="keyword">default</span> &#123;</span></span><br><span class="line"><span class="javascript"> <span class="function"><span class="title">data</span>(<span class="params"></span>)</span> &#123;</span></span><br><span class="line"><span class="javascript">  <span class="keyword">return</span> &#123; <span class="attr">data</span>: [<span class="string">&quot;苹果&quot;</span>, <span class="string">&quot;香蕉&quot;</span>, <span class="string">&quot;橘子&quot;</span>] &#125;;</span></span><br><span class="line"> &#125;,</span><br><span class="line"> components: &#123;</span><br><span class="line">  List</span><br><span class="line"> &#125;</span><br><span class="line">&#125;;</span><br><span class="line"><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br><span class="line"><span class="comment">&lt;!-- List组件渲染列表 开始循环渲染--&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">template</span>&gt;</span></span><br><span class="line"> <span class="tag">&lt;<span class="name">div</span> <span class="attr">class</span>=<span class="string">&quot;list&quot;</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">div</span> <span class="attr">v-for</span>=<span class="string">&quot;(item,index) in data&quot;</span> <span class="attr">:key</span>=<span class="string">&quot;index&quot;</span>&gt;</span></span><br><span class="line">   <span class="tag">&lt;<span class="name">li</span>&gt;</span>&#123;&#123;item&#125;&#125;<span class="tag">&lt;/<span class="name">li</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line"> <span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">template</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">script</span>&gt;</span></span><br><span class="line"><span class="javascript"><span class="keyword">export</span> <span class="keyword">default</span> &#123;</span></span><br><span class="line"> props: &#123;</span><br><span class="line"><span class="javascript">  data: <span class="built_in">Array</span>,</span></span><br><span class="line"><span class="javascript">  <span class="keyword">default</span>: <span class="function">() =&gt;</span> []</span></span><br><span class="line"> &#125;</span><br><span class="line">&#125;;</span><br><span class="line"><span class="tag">&lt;/<span class="name">script</span>&gt;</span></span><br></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//这个时候我们希望用span标签了 所以我们就可以让用户自己定义标签 然后传入到我们的render 函数里里面 其实说白了就是一个回调</span></span><br><span class="line"><span class="comment">//传进一个render函数到我们的列表组件里</span></span><br><span class="line">&lt;List :data=<span class="string">&quot;data&quot;</span> :render=<span class="string">&quot;render&quot;</span>&gt;&lt;/List&gt;</span><br><span class="line"></span><br><span class="line">methods:&#123;</span><br><span class="line">    <span class="function"><span class="title">render</span>(<span class="params">h, name</span>)</span> &#123;</span><br><span class="line">       <span class="keyword">return</span> <span class="xml"><span class="tag">&lt;<span class="name">span</span>&gt;</span>&#123;name&#125;<span class="tag">&lt;/<span class="name">span</span>&gt;</span></span>;</span><br><span class="line">     &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//这是我们的列表组件</span></span><br><span class="line">&lt;template&gt;</span><br><span class="line"> &lt;div <span class="class"><span class="keyword">class</span></span>=<span class="string">&quot;list&quot;</span>&gt;</span><br><span class="line">  &lt;div v-<span class="keyword">for</span>=<span class="string">&quot;(item,index) in data&quot;</span> :key=<span class="string">&quot;index&quot;</span>&gt;</span><br><span class="line">   <span class="comment">//然后我们判断你有没有传进来render函数 如果没有 我就用我自己的 如果我就用我下面的函数式组件   </span></span><br><span class="line">   &lt;li v-<span class="keyword">if</span>=<span class="string">&quot;!render&quot;</span>&gt;&#123;&#123;item&#125;&#125;&lt;/li&gt;</span><br><span class="line">   &lt;!-- 将render方法传到函数组件中，将渲染项传入到组件中，在内部回调这个render方法 --&gt;</span><br><span class="line">   &lt;ListItem v-<span class="keyword">else</span> :item=<span class="string">&quot;item&quot;</span> :render=<span class="string">&quot;render&quot;</span>&gt;&lt;/ListItem&gt;</span><br><span class="line">  &lt;/div&gt;</span><br><span class="line"> &lt;/div&gt;</span><br><span class="line">&lt;/template&gt;</span><br><span class="line">&lt;script&gt;</span><br><span class="line"><span class="keyword">import</span> ListItem <span class="keyword">from</span> <span class="string">&quot;./ListItem&quot;</span>;</span><br><span class="line"><span class="keyword">export</span> <span class="keyword">default</span> &#123;</span><br><span class="line"> components: &#123;</span><br><span class="line">  ListItem</span><br><span class="line"> &#125;,</span><br><span class="line"> props: &#123;</span><br><span class="line">  render: &#123;</span><br><span class="line">   type: <span class="built_in">Function</span></span><br><span class="line">  &#125;,</span><br><span class="line">  data: <span class="built_in">Array</span>,</span><br><span class="line">  <span class="keyword">default</span>: <span class="function">() =&gt;</span> []</span><br><span class="line"> &#125;</span><br><span class="line">&#125;;</span><br><span class="line">&lt;/script&gt;</span><br></pre></td></tr></table></figure>
<figure class="highlight js"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">//函数式组件 在这里调用给我们传进来的render函数 把每一项目传进去了 然后渲染到页面上</span></span><br><span class="line"><span class="keyword">export</span> <span class="keyword">default</span> &#123;</span><br><span class="line"> props: &#123;</span><br><span class="line">  render: &#123;</span><br><span class="line">   type: <span class="built_in">Function</span></span><br><span class="line">  &#125;,</span><br><span class="line">  item: &#123;&#125;</span><br><span class="line"> &#125;,</span><br><span class="line"> <span class="function"><span class="title">render</span>(<span class="params">h</span>)</span> &#123;</span><br><span class="line">  <span class="keyword">return</span> <span class="built_in">this</span>.render(h, <span class="built_in">this</span>.item);</span><br><span class="line"> &#125;</span><br><span class="line">&#125;;</span><br></pre></td></tr></table></figure>
<h2 id="插槽"><a href="#插槽" class="headerlink" title="插槽"></a>插槽</h2><figure class="highlight html"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">List</span> <span class="attr">:arr</span>=<span class="string">&quot;arr&quot;</span>&gt;</span></span><br><span class="line">    //这里就结构出来</span><br><span class="line">    <span class="tag">&lt;<span class="name">template</span> <span class="attr">v-slot</span>=<span class="string">&quot;&#123;item&#125;&quot;</span>&gt;</span></span><br><span class="line">        &#123;&#123;item&#125;&#125;</span><br><span class="line">    <span class="tag">&lt;/<span class="name">template</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">List</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;<span class="name">div</span> <span class="attr">v-for</span>=<span class="string">&quot;(item,key) in arr&quot;</span> <span class="attr">:key</span>=<span class="string">&quot;key&quot;</span>&gt;</span></span><br><span class="line">    //把值传了出去</span><br><span class="line">    <span class="tag">&lt;<span class="name">slot</span> <span class="attr">:item</span>=<span class="string">&quot;item&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">slot</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">div</span>&gt;</span></span><br></pre></td></tr></table></figure>
</article><div class="post-copyright"><div class="post-copyright__title"><span class="post-copyright-info"><h>Vue中的函数式组件</h></span></div><div class="post-copyright__type"><span class="post-copyright-info"><a href="http://example.com/2020/04/14/render%E5%87%BD%E6%95%B0%20%E5%87%BD%E6%95%B0%E5%BC%8F%E7%BB%84%E4%BB%B6%20JSX/">http://example.com/2020/04/14/render%E5%87%BD%E6%95%B0%20%E5%87%BD%E6%95%B0%E5%BC%8F%E7%BB%84%E4%BB%B6%20JSX/</a></span></div><div class="post-copyright-m"><div class="post-copyright-m-info"><div class="post-copyright-a"><h>作者</h><div class="post-copyright-cc-info"><h>北城韩雨</h></div></div><div class="post-copyright-c"><h>发布于</h><div class="post-copyright-cc-info"><h>2020-04-14</h></div></div><div class="post-copyright-u"><h>更新于</h><div class="post-copyright-cc-info"><h>2019-06-03</h></div></div><div class="post-copyright-c"><h>许可协议</h><div class="post-copyright-cc-info"><a class="icon" rel="noopener" target="_blank" title="Creative Commons" 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